<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			body{
				font-weight: bold;
				font-size: 24px;
				margin: 0;
				padding: 0;
			}
			#header,#footer{
				background: rgba(29,27,27,0.726);
				text-align: center;
				height: 60px;
				line-height: 60px;
				clear: both;
			}
			#container{
				padding: 0 200px;
				background-color: red;
				overflow: hidden;
			}
			.column{
				height: 200px;
				float: left;
				position: relative;
			}
			#left{
				width: 200px;
				margin-left: -100%;
				left: -200px;
				background-color: aqua;
			}
			#right{
				width: 200px;
				margin-left: -200px;
				right: -200px;
				background-color: purple;
			}
			#center{
				width: 100%;
				background-color: tomato;
			}
		</style>
	</head>
	<body>
		<div id="header">这是头部盒子</div>
		<div id="container">
			<div id="center" class="column">这是中间盒子的中间盒子</div>
			<div id="left" class="column">这是中间盒子的左边盒子</div>
			<div id="right" class="column">这是中间盒子的右边盒子</div>
		</div>
		<div id="footer">这是底部盒子</div>
	</body>
	<script type="text/javascript">
			

	</script>
</html>
